APA
Lucas, . (1916). The British empire :six lectures. London: Macmillan and company Ltd.
Chicago
Lucas, . 1916. The British empire :six lectures. London: Macmillan and company Ltd.
Harvard
Lucas, . (1916). The British empire :six lectures. London: Macmillan and company Ltd.
MLA
Lucas, . The British empire :six lectures. London: Macmillan and company Ltd. 1916.